--- /dev/null
+/* Test of POSIX and GNU compatible obstack_[v]zprintf() functions.
+ Copyright (C) 2007-2024 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
+
+/* This test exercises only a few POSIX compliance problems that are still
+ visible on platforms relevant in 2024. */
+
+#include <config.h>
+
+#include <stdio.h>
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "obstack.h"
+
+#include "macros.h"
+
+#define obstack_chunk_alloc malloc
+#define obstack_chunk_free free
+
+static void
+test_function (ptrdiff_t (*my_obstack_zprintf) (struct obstack *, const char *, ...))
+{
+ struct obstack obs;
+ obstack_init (&obs);
+
+ #define RESULT_EQ(expected) \
+ (len == strlen (expected) && memcmp (result, expected, len) == 0)
+
+ /* Test the support of the 'B' conversion specifier for binary output of
+ integers. */
+
+ { /* This test would fail on all platforms other than glibc ≥ 2.35. */
+ ptrdiff_t len =
+ my_obstack_zprintf (&obs, "%#B %d", 12345, 33, 44, 55);
+ ASSERT (len >= 0);
+ char *result = obstack_finish (&obs);
+ ASSERT (RESULT_EQ ("0B11000000111001 33"));
+ obstack_free (&obs, result);
+ }
+
+ obstack_free (&obs, NULL);
+}
+
+static ptrdiff_t
+my_obstack_zprintf (struct obstack *obs, const char *format, ...)
+{
+ va_list args;
+ ptrdiff_t ret;
+
+ va_start (args, format);
+ ret = obstack_vzprintf (obs, format, args);
+ va_end (args);
+ return ret;
+}
+
+static void
+test_obstack_vzprintf ()
+{
+ test_function (my_obstack_zprintf);
+}
+
+static void
+test_obstack_zprintf ()
+{
+ test_function (obstack_zprintf);
+}
+
+int
+main (int argc, char *argv[])
+{
+ test_obstack_vzprintf ();
+ test_obstack_zprintf ();
+ return test_exit_status;
+}